castflip 0.1.15

Library for encoding/decoding numeric variables, arrays and structures in little-endian and big-endian
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How to convert between bytes and a `struct`

This crate provides methods to convert between a byte representation
of a regular `struct` type (with named fields), a tuple `struct` type
(with unnamed fields) or a `union` type and a value of the type with
endianness handling.

For the sake of simplicity, the examples below convert only a regular
`struct` type.

# 1. Converting Bytes to a `Struct`

The example below *encast*s[^encast] a byte representation of struct
`Coord` in big-endian ([`BE`]) as a value of the type in native-endian
by using method [`EncastMem::encastf`].

```rust
# fn main() {
use castflip::{BE, Cast, EncastMem, Flip};

#[repr(C)]
#[derive(Cast, Flip)]
struct Coord {
    x: u16,
    y: u16,
}

let in_bytes: [u8; 4] = [0x12, 0x34, 0x56, 0x78]; // in Big-Endian (`BE`)
let out_coord: Coord = in_bytes.encastf(BE).unwrap();
assert_eq!(out_coord.x, 0x1234);
assert_eq!(out_coord.y, 0x5678);
# }
```

In the case where an input byte representation is in native-endian,
method [`EncastMem::encast`] can be used instead.

# 2. Converting a `Struct` to Bytes

The example below *decast*s[^decast] a value of struct `Coord` in
native-endian as a byte representation of the type in big-endian
([`BE`]) by using method [`DecastMem::decastf`].

```rust
# fn main() {
use castflip::{Cast, DecastMem, Flip, LE};

#[repr(C)]
#[derive(Cast, Flip)]
struct Coord {
    x: u16,
    y: u16,
}

let in_coord = Coord { x: 0x8765, y: 0x4321 };
let mut out_bytes: [u8; 4] = [0; 4];
out_bytes.decastf(&in_coord, LE).unwrap();
assert_eq!(out_bytes, [0x65, 0x87, 0x21, 0x43]); // in Little-Endian (`LE`)
# }
```

In the case where an output byte representation is in native-endian,
method [`DecastMem::decast`] can be used instead.

[^encast]: In this crate, to *encast* means to cast a byte
representation of a type as a value of the type.

[^decast]: In this crate, to *decast* means to cast a value of a type
as a byte representation of the type.